| Part of speech | common noun |
|---|---|
| Hyphenation | re·gul·o |
| Singular | Plural | |
|---|---|---|
| Nominative | regulo | reguloj |
| Accusative | regulon | regulojn |
| Afrikaans | reël |
|---|---|
| Catalan | regla |
| Czech | pravidlo; předpis |
| Danish | regel |
| Dutch | regel |
| English | regulation; rule |
| English (Old English) | regol |
| Faeroese | regla |
| French | règle |
| German | Regel |
| Italian | regola |
| Low German | regel; reagel |
| Luxemburgish | Regel |
| Papiamento | regla |
| Portuguese | preceito; regra |
| Russian | правило |
| Saterland Frisian | Räägel |
| Spanish | regla |
| Swedish | regel |
| Thai | กฎ |
| West Frisian | regel |